Sulfur dye and process of making same.



- EDWARD S. OHAPIN, OF NEW YORK, N. Y.

SI JLFUR DYE AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Patented Jan. 12, 1909.

Application filed February 24, 190i. Serial No. 302,745.

To all whom it may concern:

Be it known that I, EDWARD S. CHAPIN, a citizen of the United States,residing in the borough of Brooklyn, city and State of New York, haveinvented certain new and useful I Improvements in Sulfur Colors andProcess of Making the Same, of which the following is a specification.

My invention consists in heating salicylic acid (or its sodium salt)with sulfuring substances until a beautiful golden brown bronzedyestufi' is produced.

The following example may serve to show the manner in which thiscoloring matter may be produced. Into a suitable crucible weigh 60 gramsof sodium sulfid crystals and 1.5 grams of sulfur. Boilto dissolve thesulfur. Add 200 c. c. of water and 12 grams of salicylic acid. Evaporatethe water and raise the temperature gradually to 300 C. Heat at 300until the full strength of the coloring matter is produced. This willtake about. three hours.

The coloring matter produced is readily soluble in cold water, in coldalcohol, in alkaline and sodium sulfid solution to a golden brown bronzesolution, and dyes cotton directly in a salt bath fast golden brownbronze shades.

The coloring matter produced. may be concentrated in the usual manner byacids;

in which case the purer more concentrated dyestutf obtained is insolublein water or cold alcohol, soluble iii sodium sulfid solutions to a richgolden brown bronze solution, and dyes cotton in a salt bath with theassistance of sal soda and sodium sulfid rich and fast golden brownbronze shades.

The dye is of a very good fastness to light, and fulling. Byafter-treatment with ordinary metallic salts these fastnesses areincreased although the shade is changed somewhat. By after-treatmentwith blue stone the shade becomes an olive of remarkable fastness.-

In place of salicylic acid'I may use the sodium salt of salicylic acidwhich two substances are equivalents in the described reaction. Whenspeaking; in the claims of salicylic acid I intend to cover anyequivalents of that substance, including its sodium salt.

I claim: I

1. The process of making a coloring matter consistingin heatingsalicylic acid, with sodium sulfid and sulfur, substantially asdescribed.

2. The coloring matter produced by heat.

ing salicylic acid, with sodium sulfid. and sulfur, substantially asdescribed, which is readily soluble in cold Water, in cold-alcohol,inalkaline and sodium sulfid solution to a golden brown bronze solution,and dyes cot-- ton directly in a salt bath fast golden brown bronzeshades, and forms when precipitated with an acid, a coloring matterwhich is insoluble in water or cold alcohol, soluble. in

sodium sulfid solution to a rich golden

